View Full Version : What is the function of this

03-07-2011, 10:04 AM
I know it does something with the speedos, but not exactly sure what?

Thanks, Jay

03-07-2011, 11:53 AM
my guess is that it converts the water pressure into air pressure, from the pitot style pickups.

Just a guess though.

03-07-2011, 12:13 PM
IIRC some boats had those to try to stabilize the fluctuation of the speedometer.

03-07-2011, 12:24 PM
Is it necessary to have? If i bought new pitot's will they work without them?

Thanks, Jay

Table Rocker
03-07-2011, 12:25 PM
My '96 has two of those mounted to the front of the fuel tank. They are between the pitot and the speedo and I assume they are pressure chambers. As thatsmrmastercraft stated, I believe they help steady the needle on the speedo.

I believe it is called a pitot ballast.

03-07-2011, 12:32 PM
Leave them alone. If they are missing, or if the chamber inside them is ruptured, water will get pushed up to the speedometers.

03-07-2011, 12:44 PM
Ok, thanks, will just try to clean them up a bit, i know they are out of sight, but still like them to look good..thanks for all the quick replies..man i love this site...


03-07-2011, 03:02 PM
Makes me feel like an old fart when I actually know the purpose of those strange brass tubes. Technology today has made speedometers all but obsolete. Driving a skier through the course by hand is unheard of in most circles. Now if my car would just fly like on the Jetsons?

03-20-2011, 02:53 AM
Over time water can get up inside these and freeze in the winter causing them to split . . . but I see you're in the SE so maybe no issue.8p